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Particle-wall collision in a viscoelastic fluid

Published online by Cambridge University Press:  25 August 2009

A. M. ARDEKANI ,
D. D. JOSEPH ,
D. DUNN-RANKIN  and
R. H. RANGEL
A. M. ARDEKANI
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California, Irvine, CA 92697-3975, USA
D. D. JOSEPH
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California, Irvine, CA 92697-3975, USA Department of Aerospace Engineering and Mechanics, University of Minnesota, MN 55455, USA
D. DUNN-RANKIN
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California, Irvine, CA 92697-3975, USA
R. H. RANGEL*
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California, Irvine, CA 92697-3975, USA
*
†Email address for correspondence: [email protected]
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Abstract

In this study, we present experimental results on particle-wall collision in viscoelastic fluids. A sphere is released in a tank filled with poly(ethylene-oxide) (PEO) mixed with water with varying concentrations up to 1.5%. The effect of Stokes and Deborah numbers on the rebound velocity of a spherical particle colliding onto a wall is considered. It has been observed that the slope at which the coefficient of restitution increases with Stokes number is smaller for higher Deborah numbers. Higher rebound occurs for higher PEO concentration at the same stokes number. However, the results for the coefficient of restitution in polymeric liquids can be collapsed together with the Newtonian fluid behaviour if one defines the Stokes number based on the local strain rate.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 633 , 25 August 2009 , pp. 475 - 483
Copyright
Copyright © Cambridge University Press 2009

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